Improvement in steam-generators



PATENT ETE.

ELBRIDGE GODDARD, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 144,024, dated October28, 1873; application filed May 24,1873.

To all whom it may concern:

Be it known that I, ELBETDGE Gonnnnn, of the city and county of St.Louis, State of Missouri, have invented a new and useful Improvement inSteam-Generators, of which the following is a full, clear, and exactdescription, reference being had to the annexed drawing making a part ofthis specification, in which- Figure 1 represents a side elevation. Fig.2 represents a bottom plan. Figs. 3 and 4 represent, respectively, frontand rear elevations.

Similar letters indicate like parts.

My invention relates to those attachments to steam-generators by which acirculation of the water therein is produced; and consists in a novelmode of constructing and attaching the pipes by which such result isattained. One of the results of my method is a thorough purification ofthe water in the generator by causing the impurities in the same to bemore certainly deposited in the usual mud-drums, and being' allowed toremain there undisturbed by the moving water in the generator. Suchp'uriication, especially with the waters of the western rivers, isalmost impossible to obtain when the circulatingpipes are in any wayattached to the mud-drum, 'since such attachment inevitably causes suchan agitation of the water in the drums as to prevent the necessarysettling of same, and therefore more or less of the sediment is againcarried into the generator. Another object I have is to prevent theburning out of the bottom of the generator, where the most intenseflames strike it, by so introducing the water from the circulat-ling-pipes that it shall cause a circulation-directly along the bottom ofthe generator, and by introducing the water at the front of thegenerator, and as near as possible to the bottom thereof, where the heatis most intense, to obviate the danger of the water lifting at thatpoint by reason of the extreme heat, and leaving the plates bare.

A in the several igures represents a boiler of the ordinaryconstruction, having two of the common mud-drums, B B', Figs. l, 2; B,Fig. 3; B', Fig. 4; G O', Figs. 2, 3, 4. G', Fig. l, are two ordinarypipes, such as are commonly used for this purpose, arranged, as seen inFig. 2, beneath the boiler, and connected with it by the pipes c c, Fig.1 c c, Figs. 2, 3, c c, Fig. 4, entering the shell of the boiler as nearthe bottom'as possible. The pipes C C are arranged inclining, as seen inFig. 1, the lower part being at the rear of the boiler and just escapingthe rear mud-drum,as seen, while the forward ends of the pipes are asclose to the boiler as possible, so as to be clear of the tire, and thusnot interfere with theycourse of the flame. Of course the boiler isinclosed in the ordinary mann er, the rear ends of the pipes C Oextending through the wall, thus enabling the caps at the end of thepipes to be readily removed for the purpose of cleaning the pipes, theother ends of the pipes being within the tire-walls. The water isintroduced into the boiler in any manner most convenient. Vhen theboiler is filled, ofcourse the pipes C C will be full. Now, when `thefires are started, of course the water first becomes hot at the frontend of the boiler and the pipes O O, causing a movement of the wateraway from the heat, the consequence of which is that the cooler water inthe rear of the pipes naturally seeks the hotter part of the pipes,thereby starting the circulation in the pipes, and continuing the sameas long as the lires are kept up and the supply of water furnished. Thiscirculation, it is evident, must be directly along the bottom plates andover the legs of the mud-drums, thus allowing the impurities suspendedin the water to fall into the drums, and keeping up a vcontinual scouring of the bottom plates, and

not allowing any of the sediment falling on the plates to remain there.The size of the pipes (.l G and of their connections with the boilersmay be as desired; but the connections must be made as near the bottomof the boiler and as near the ends of same as possible, so as to insurea circulation on the bottom of the boiler, and also have no dead waterat the ends of the boiler. y.

I am well aware that there is no novelty in the use of circulatingpipesto induce a circulation of water in a boiler, such pipes connectinghigher and lower portions of the boiler and passing through the lire;and I am also aware that pipes have been used which take the water from'and introduce it at the same level and below the water-line; and I amalso aware that pipes have been arranged inclining; and, consequently, Ido not claim either of these separately; but

What I claim as my 'invention7 and desire to secure by Letters Patent,is-

The combination, With a steainrgenerzttor, of the circulating-pipes C Cand the connectingpipes c c c 0"', the said circulating-pipes beingarranged inside the fire-Walls, (md having their rear ends lower thantheir forward ends7 and l their connection with the generator being suchthat they take the Water from and introduce it into the generator at theends, and as near the bottom thereof as possible7 substantially as shownand specified.

ELBRIDGE GODDARD.

Witnesses:

CHAs. D. MOODY, SAML. S. BOYD.

